1st board: Bring water to the lava, release the 2 fireflies, and open the exit with the Magic Orb, due to the dumb design often there will be no matches at the bottom and there is no way to change that except with so many moves that there won't be enough left even for the second board. If there are no matches at the entry, restart the level. There is no way to rearrange the gem stones by making matches elsewhere. Dumb design again.

2nd board: Bring water to the lava, release the firefly, exit. Do not use the Magic Orb!

3rd board: Bring water to the lava, then use the Magic Orb to break the steel block. Often you can never make any matches at the entry, another dumb design :-(